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Hydraulic hose – assembled according to your specifications (length, fittings, design)
Our assembled hydraulic hoses ensure the safe transfer of hydraulic fluids under high pressure in industry, construction, and agriculture. With our hydraulic hose configurator, you can customize length, fittings, and design individually and receive hoses of top quality, characterized by high flexibility and durability. Learn more...
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Choose from braided hoses for medium and high pressure, robust spiral hoses for extreme applications, as well as special high-pressure washer and universal hoses. Our hydraulic hose bulk material is available in different sizes and pressure classes, providing maximum safety in accordance with common standards such as EN 853, EN 857, and EN 856. Each hose is designed for durability – with an inner tube, wire braid reinforcement, and a protective outer cover.
Hydraulic Hoses & Crimp Fittings – Frequently Asked Questions
What are the main components of a hydraulic hose and what is the function of each component?
A hydraulic hose has a multi-layered structure:
- Inner tube: Carries the hydraulic fluid and must be chemically resistant (e.g. NBR, EPDM, PTFE, Viton).
- Reinforcement: Provides pressure resistance and dimensional stability. Typically made of textile or steel wire braids, sometimes glass or carbon fibers.
- Outer cover: Protects against abrasion, oil, UV radiation, ozone, and environmental influences (e.g. polyamide, polyurethane).
Crimp fittings made of steel or stainless steel are permanently crimped onto the ends to ensure a secure and leak-free connection to the hydraulic system.
What types of reinforcements are used in hydraulic hoses and what are their advantages and disadvantages?
- Single-layer reinforcement: Very flexible with a small bending radius, but limited pressure capacity. Suitable for low-pressure systems.
- Multi-layer reinforcement: Higher pressure resistance, good kink resistance, but less flexible. Typical for medium-pressure systems.
- Spiral reinforcement: Extremely pressure- and shock-resistant, minimal length change under pressure, but stiffer and heavier. Essential for high-pressure systems and construction machinery.
The more layers or wires, the higher the load capacity – but flexibility and bendability decrease.
What criteria are crucial when selecting the right hydraulic hose?
The following criteria determine the selection:
- Pressure range: Must safely cover working and peak pressures.
- Medium: Material compatibility (e.g. mineral oil → NBR, water-glycol → EPDM, phosphate esters → PTFE/FKM).
- Temperature range: Depending on fluid and environment.
- Environmental conditions: Abrasion, chemicals, UV, moisture.
- Bending radius & flexibility: Must meet installation requirements.
- Standards: DIN, ISO, SAE or EN, as well as marking requirements.
- Fittings: Must match hose size and connection type.
What role do crimp fittings play in hydraulic hoses and what must be considered during installation?
Crimp fittings ensure a secure, leak-free connection between the hose and system components.
- Function: Connection and sealing within the hydraulic system.
- Material: Usually steel or stainless steel, in DIN, BSP, or SAE designs.
- Installation: Performed with a crimping machine, the fitting must be positioned precisely.
- Inspection: The crimp sleeve diameter must be checked after crimping.
- Safety: Improper crimping leads to leaks or hose bursts. Fittings must not be reused!
What advantages do hydraulic hoses offer compared to rigid pipes?
- Flexibility: Compensates for movements, vibrations, and installation inaccuracies.
- Vibration damping: Prevents material fatigue and reduces noise.
- Easy installation: Especially in confined spaces.
- Standardized connections: Facilitate replacement and maintenance.
- Space saving: Allows more compact routing.
How often must hydraulic hoses be inspected and replaced, and which standards regulate this?
Maintenance and replacement are regulated by DGUV rules and standards:
- After installation: Immediate inspection before initial operation.
- Regularly: At least annual visual inspection by a qualified person, shorter intervals if necessary.
- Extraordinary: After accidents, overheating, collisions, or changed operating conditions.
- Replacement intervals: Max. 6 years (including max. 2 years storage). Shorter under extreme conditions.
An extension beyond 6 years is only allowed with a written risk assessment and shortened inspection intervals.
What material compatibility must be considered when selecting the inner tube with regard to different hydraulic fluids?
- NBR: For mineral oil-based hydraulic fluids. Not suitable for water-based media.
- HNBR: Improved heat and ozone resistance, also for synthetic oils.
- EPDM: For water-glycol and emulsions, not suitable for mineral oils.
- PTFE: For aggressive, highly corrosive media, temperature range -60°C to +250°C.
- Viton (FKM): For phosphate esters and synthetic fluids, very high temperature resistance.
In case of doubt, always consult the safety data sheet of the fluid.
Where are hydraulic hoses typically used and why are they advantageous there?
- Mobile hydraulics: Agricultural machinery, excavators, cranes, forestry machines. Advantage: flexibility, vibration damping, mobility.
- Stationary hydraulics: Machine tools, presses, production equipment, robotics. Advantage: compensation for vibrations and installation inaccuracies.
- Special applications: Aerospace, mining, wind energy, marine. Advantage: high pressure and temperature resistance, fluid compatibility.
Essential wherever fluids must be transported under pressure between moving or vibrating components.
